Estimated size of illicit market
Vellios, N., van Walbeek, C.P., Ross, H. 2017
Ross, H., Vellios, N., Clegg Smith, K. et al. 2016
Ross, H., Vellios, N., Clegg Smith, K. et al. 2016
Chen, J., McGhee, S.M., Townsend, J. et al. 2015
European Commission 2015
Blecher, E.H., Liber, A., Ross, H. et al. 2015
Çetinkaya, V., Marquez, P.V. 2015
Her Majesty’s Customs and Excise 2015
Kieyah, J., Shibia, A.G., Gitonga, A. 2014